It is thought that eukaryotes probably originated about _____ years ago.
A. 2 billion
B. 6 million
C. 1 billion
D. 4 million
E. 3 billion
A. 2 billion
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Which process listed below does NOT require homologous recombination to maintain the new genetic material in the recipient cell?
A) conjugation of an F+ plasmid B) gene transfer through a genetic transfer agent C) transduction by a dsDNA phage Mu D) transformation of a linear piece of DNA
Trace fossils include all of the following except:
A. the mineralized skull of an ancient mammal. B. the trail left by a crawling worm. C. the impression of a bird feather. D. a dinosaur footprint. E. the burrow of an extinct crab.
Cattle egrets follow African ungulates such as African buffalo around and catch insects that the buffalo flush out. Oxpeckers perch on the backs of buffalo and feed on ectoparasites that infest the buffalo. Which one of the following shows the ecological interaction that the buffalo has with each bird?
A. cattle egret: mutualism; oxpecker: commensalism B. cattle egret: commensalism; oxpecker: mutualism C. cattle egret: competition; oxpecker: mutualism D. cattle egret: mutualism; oxpecker: mutualism E. cattle egret: commensalism; oxpecker: commensalism Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about symbiotic relationships and the qualifications for each? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
It is hypothesized that the high diversity of rock-dwelling species within the cichlids is due to:
a. allopolyploidy. b. poor water quality. c. polyploidy coloration. d. disruptive sexual selection. e. macroevolution